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enThu, 22 Feb 2018 04:22:39 GMTvBulletin60http://forums.mikeholt.com/images/misc/rss.pnghttp://forums.mikeholt.com/
Generator Panel power factor improvementhttp://forums.mikeholt.com/showthread.php?t=189885&goto=newpost
Thu, 22 Feb 2018 04:15:31 GMTDo we need to place a PFI plant on the generator panel?
Your valueable comments are awaited.
Sent from my GT-I9300I using TapatalkDo we need to place a PFI plant on the generator panel?

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]]>NECGreghollishttp://forums.mikeholt.com/showthread.php?t=189884http://forums.mikeholt.com/showthread.php?t=189883&goto=newpost
Thu, 22 Feb 2018 02:36:57 GMTIf you take a resistance reading with a dmm and it is set on auto, and the reading shows "M" for Mega (example, 18.42 M Ohm's), I'm assuming that would be equivalent to 18,420,00 Ohm's?

I had a brain fart today while troubleshooting some tile floor heat, related to their rated resistance and have been second guessing myself all afternoon!

The heating element is rated for 16 Ohm's. It's not putting out heat. No current draw at t-stat.
Not sure if heating element was compromised during tile install. Was ohm'ing out the leads to element and definitely didn't get 16 Ohm's. Tried a couple of meters with similar results.

]]>NECcodequestionhttp://forums.mikeholt.com/showthread.php?t=189882Do LED lights degrade over timehttp://forums.mikeholt.com/showthread.php?t=189880&goto=newpost
Wed, 21 Feb 2018 20:14:27 GMTDoes the lumen output of an LED bulb degrade over time. It appears that bulbs that were installed 2 years ago do not have the light output that I...Does the lumen output of an LED bulb degrade over time. It appears that bulbs that were installed 2 years ago do not have the light output that I remember when installed. Since these are in corridors and stairway, my concern is adequate light levels for code compliance. Will obtain light meter to check, but wondered about bulbs getting "dimmer" over time.
]]>Lighting102 Inspectorhttp://forums.mikeholt.com/showthread.php?t=1898804 Hzhttp://forums.mikeholt.com/showthread.php?t=189879&goto=newpost
Wed, 21 Feb 2018 20:04:38 GMT180221-1437 EST
Who is transmitting at 4 Hz or thereabouts. I suspect Russia or US for under water communication.
In playing with measurement...180221-1437 EST

Who is transmitting at 4 Hz or thereabouts. I suspect Russia or US for under water communication.

In playing with measurement of stray magnetic fields I noticed a change in the background level. I was reading in the 20 micro volt level (a relative measure), then it jumped to 40 to 50 microvolts. Put this on a scope and it is not random noise, but a carrier of some sort around 250 milliseconds period.

The signal is detectable and measurable, and it will be everwhere. So this is something that should bother all those hyper-electromagnetic field sensitive people.

A little later the frequency seemed to change to around toward 10 Hz. Now it is mostly gone and I am back to a 10 to 20 microvolt noise level.

I am using 1500 turns on the coil and a Beckman 4.5 digit meter that resolves 10 mictrovolts.

.
]]>General Electrical Forumgarhttp://forums.mikeholt.com/showthread.php?t=189879Fuel pump requirementshttp://forums.mikeholt.com/showthread.php?t=189878&goto=newpost
Wed, 21 Feb 2018 19:53:40 GMTI've been asked to give a bid on electrical work for two 530 gallon above ground fuel barrels with electric pumps for the Dept. of Natural Resources. They are being installed new on a newly poured concrete slab approx. 10 feet away from the building they will be getting power from. Each pump has a 5.5 amp current draw. I've not wired gas pumps before. I'm thinking a 1/2" rigid conduit underground from the building to the pump.

Is LFMC acceptable to make the connection to the pump from the rigid conduit that comes out of the ground?

Do I need an emergency shut off at the building for each of the pumps? If so, where do they need to be located?

Are the rigid couplings acceptable to be explosion proof?

Also, do I need a seal inside of the end of the conduit?

Any other things I am missing?

Thank you.
]]>Hazardous (Classified) Locationsammklq143http://forums.mikeholt.com/showthread.php?t=189878Adding Heating Element to Aqueous Parts Washerhttp://forums.mikeholt.com/showthread.php?t=189877&goto=newpost
Wed, 21 Feb 2018 19:32:56 GMTI would like to add a heating element to a metal parts washer for automotive use. The parts washer is a metal cabinet on legs that will carry 24...I would like to add a heating element to a metal parts washer for automotive use. The parts washer is a metal cabinet on legs that will carry 24 gallons of an aqueous washing solution. The washing solution works more efficiently if heated to 120 degrees Fahrenheit. This would be a 120v circuit preferably coming from a GFCI outlet. The circuitry would be similiar to a hot water heater.

My question is should the actual metal washer itself have an electrical ground fault circuit installed leading from the washer back to the ground on the receptacle or does the GFCI itself prevent risk of electrocution?
]]>Grounding versus Bondinggeorgiatoffeehttp://forums.mikeholt.com/showthread.php?t=189877Interesting Problemhttp://forums.mikeholt.com/showthread.php?t=189876&goto=newpost
Wed, 21 Feb 2018 18:55:58 GMTThis past Saturday I was doing some work at an old residence. One problem I ran across was an upstairs receptacle that I could not secure power to...This past Saturday I was doing some work at an old residence. One problem I ran across was an upstairs receptacle that I could not secure power to unless I turned off two 15 amp breakers. The breakers were a tandem on a multiwire branch circuit. Nothing in the panel looked out of place. I assumed that the ungrounded conductor of one circuit is crossed with an ungrounded conductor of another circuit on the same leg in the panel, however that does not make any sense, because the breakers are shut off we're on different legs. I measured 120 volts between hot and neutral on the receptacle in question. I'm stumped as to how that circuit is being basically double fed. The panel had Bryant Breakers I think it was a 60 or hundred amp panel. Thoughts? ETA... If The Minis on a Bryant panel are on the same leg that would make sense but I always thought that it would be on different legs. Now that I think about it more, one breaker space in the panel, and both of those Breakers would be on the same leg so they shouldn't be a multiwire branch circuit correct? That would also explain the burned up neutral I found.
]]>General Electrical ForumJFletcherhttp://forums.mikeholt.com/showthread.php?t=189876Gfic reading reverse hot/neutral when tripping.....http://forums.mikeholt.com/showthread.php?t=189875&goto=newpost
Wed, 21 Feb 2018 17:27:01 GMTWorking in a 120/208 pannel, have circuits 25,27,29 feeding 3 different recpticals. 1 is a gfi and it reads correct till I use a plug checker to trip...Working in a 120/208 pannel, have circuits 25,27,29 feeding 3 different recpticals. 1 is a gfi and it reads correct till I use a plug checker to trip it and it then reads reverse hot/ neutral. I switches the gfi with another working 1 to see if it was defective and it works perfect on existing pannel.
]]>General Electrical ForumKreisshttp://forums.mikeholt.com/showthread.php?t=189875Outside Feeder (NEC 225 Part II and Part III)http://forums.mikeholt.com/showthread.php?t=189874&goto=newpost
Wed, 21 Feb 2018 16:42:47 GMTHi,
I have two different outside feeders that are penetrating building walls:
1. 480V feed from an outdoor substation switchboard to a 480V...Hi,

I have two different outside feeders that are penetrating building walls:

1. 480V feed from an outdoor substation switchboard to a 480V panel inside a building to feed a few pieces of equipment. This is not a service, this is only for a few tools. Building has other substations inside that feed other equipment.
2. 12KV feed from an outdoor substation to a new 12kv/4160V transformer in a building to then serve one tool. There are no other power sources.

I am looking at NEC Part II and Part III (for item 2 above). These sections focus on disconnecting means to the buildings. Here are my questions:

1. Does this section apply to both cases? I'm guessing yes because it is not a service. I thought it may not because for the 480V feed mentioned above we aren't feeding a distribution board for an entire building, but rather just a few tools.

2. I noticed for under 1000V, there is no requirement for lockable disconnect. Why is this?

3. For the 480V feed, I wanted to use the exception for 225.32 since there are qualified maintenance personnel onsite. The code doesn't clearly delineate how far the disconnect may be outside a building. Our substation switchboard has a 480V breaker outside the building, and it is pretty close (around 20 ft.). But again, it isn't exactly attached to the building itself. And the code doesn't say how far you can go from the exterior or interior. Do I need to even use the exception in this case?

4. For the 480V feed, the type is a standard breaker inside a fenced, locked area only accessible to qualified personnel. Is this ok? I don't see anything that prohibits this since there is no lockable requirement.

5. For the 12 KV feed, just like the 480 its outside in a substation (10 feet from the exterior of the building it serves). But the problem is this is a fuse, not a breaker. I'm assuming this fuse has a switch as well, so that would be the disconnecting means since 225.56(B) mentions fused switches. But Section 225.52(C) requires it to be lockable. So now I need to ensure there are provisions in place. Is there anyway around this? I don't have to have to install a new 12KV disconnect just to make it lockable.
]]>NECminesh21http://forums.mikeholt.com/showthread.php?t=189874Removing Recptacleshttp://forums.mikeholt.com/showthread.php?t=189873&goto=newpost
Wed, 21 Feb 2018 15:51:17 GMTHello everyone. I'm removing old receptacles from a house. These receptacles have two hots and two neutrals and 2 grounds are pigtailed. When removing one of the outlets the lights turned off but I like the lights to remain working. How do I cap off the two neutrals and two hots to keep the lights working is my question. Thanks
]]>General Electrical ForumTrayLo1201http://forums.mikeholt.com/showthread.php?t=189873City Inspectorhttp://forums.mikeholt.com/showthread.php?t=189872&goto=newpost
Wed, 21 Feb 2018 06:04:10 GMTHi Gents,
Have any of you served as an electrical inspector on city public works projects?It would be great if someone could share their...Hi Gents,

Have any of you served as an electrical inspector on city public works projects?It would be great if someone could share their experience and give an overview of the responsibilities. Curious to know about day to day operations - our city is expecting a surge of telecommunications encroachments, and will need inspectors to oversee the work..

Cheers,
FF
]]>General Electrical ForumFaradayFFhttp://forums.mikeholt.com/showthread.php?t=189872http://forums.mikeholt.com/showthread.php?t=189871&goto=newpost
Wed, 21 Feb 2018 03:43:18 GMTwirenutting several EGC's to a single which then goes to the ground (or neutral if service) bar. Is this compliant? I always thought it was, but looking at 250.122(C) seems to only mention raceway, cable, or cable tray. No cabinets. IS there another section I am not aware of?
]]>Grounding versus Bondingelectrofelonhttp://forums.mikeholt.com/showthread.php?t=189871Emergency generator requiredhttp://forums.mikeholt.com/showthread.php?t=189870&goto=newpost
Wed, 21 Feb 2018 02:15:20 GMTDoes day rehabilitation center for adults with disabilities require emergency generator?
Sent from my SM-G935U using TapatalkDoes day rehabilitation center for adults with disabilities require emergency generator?

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]]>NECcodequestionhttp://forums.mikeholt.com/showthread.php?t=189870